<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
        .box {
            width: 300px;
            height: 300px;
            border: 1px solid #000;
            margin: 100px auto 0;
            position: relative;
            padding-left: 60px;
            text-align: center;
            line-height: 300px;
        }
        
        @font-face {
            font-family: 'iconfont';
            src: url('fonts/iconfont.eot');
            src: url('fonts/iconfont.eot?#iefix') format('embedded-opentype'), url('fonts/iconfont.woff2') format('woff2'), url('fonts/iconfont.woff') format('woff'), url('fonts/iconfont.ttf') format('truetype'), url('iconfont.svg#iconfont') format('svg');
        }
        
        .box::after {
            content: "\e6d3";
            width: 20px;
            height: 20px;
            /* background-color: pink; */
            position: absolute;
            right: 0;
            top: 140px;
            font-family: "iconfont";
            /* line-height: 300px; */
        }
        
        .box::before {
            content: "\e6cd";
            width: 20px;
            height: 300px;
            /* background-color: purple; */
            position: absolute;
            left: 0;
            top: 0;
            font-family: "iconfont";
        }
    </style>
</head>

<body>
    <div class="box">
        ZzZ
    </div>
</body>

</html>